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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. See the documentation for help with subscribing to or submitting Circulars.

Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search

To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

42241 results found.

  1. GRB020813, UBVRI field calibration
  2. GRB 020813: addendum to GCN 1498
  3. GRB020813: optical observations at Bisei
  4. GRB020813: V-band decay slope
  5. GRB020812: NIR observations
  6. Polarimetry of GRB020813: evidence for variability
  7. GRB020813 IRAM millimeter observations
  8. GRB020812: optical observations
  9. GRB020813: High-Resolution Optical Observations
  10. GRB020813(=H2262): Revised Localization with HETE SXC
  11. GRB 020812: optical observation at Bisei
  12. GRB020813: Early Time Magnitude
  13. GRB020813: optical observations; possible host galaxy
  14. GRB 020813, radio detection
  15. GRB 020812 : optical afterglow candidate
  16. GRB020813, optical observations
  17. Millimeter observation of GRB 020813
  18. GRB020812: optical observations
  19. GRB 020813 : KISO multiband optical observations
  20. GRB020813, optical observations
  21. IPN error box for GRB020813
  22. IPN triangulation of GRB020813
  23. GRB020812: possible afterglow candidate
  24. Early Time Limits for GRB020813
  25. GRB020812: possible afterglow candidate
  26. GRB020813, astrometric position
  27. Spectropolarimetry of GRB 020813
  28. GRB 020813: Absorption redshift
  29. GRB 020813 multiband optical observations
  30. GRB020813: optical afterglow
  31. GRB020813: Fading of Candidate OT
  32. GRB020813(=H2262): A Long, Bright Burst Localized by HETE in Near-Real Time
  33. GRB020813: Candidate Optical Afterglow
  34. GRB 020812 optical observation
  35. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  36. GRB 020715, optical observations
  37. GRB 020714, optical observations
  38. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  39. HST Imaging of the Host of GRB 011121
  40. GRB020801, optical afterglow candidate
  41. Further refinement to IPN error box for GRB020531
  42. GRB020331: Late-time Optical Light Curve (re-submission)
  43. GRB020331: Late-time Optical Light Curve
  44. GRB 020405: HST observations reveal red bump
  45. GRB 020410: Discovery of Probable OT by HST
  46. GRB 020124, HST observations of the fading afterglow
  47. IPN triangulation of GRB020708
  48. Correction to IPN error box for GRB020706
  49. GRB 020705: Optical observations
  50. GRB 020625, optical observations
  51. GRB 020625: Optical observations
  52. GRB 020531: optical photometry of Chandra sources
  53. GRB020625 (=H2081): A Long Burst Localized by HETE
  54. HETE #2081: Optical observations
  55. The Probable Host Galaxy of GRB/XRF 020427
  56. GRB/XRF 020427, detection of an underlying system with the VLT
  57. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  58. SGR-like X-ray Bursts from AXP 1E 2259+586: follow-up
  59. AXP 1E2259+586: quasi-simultaneous optical observation
  60. AXP 1E2259+586 optical observations
  61. Fading Optical Source in the Field of GRB020531
  62. GRB 020531, INT+WFC deep optical upper limits
  63. GRB020405: polarimetric observations
  64. GRB 020531, simultaneous optical observations
  65. GRB 020604, optical observations
  66. GRB 020531/Candidate Redshift
  67. GRB020531: Detection of Candidate Host Galaxy
  68. GRB020531: Second epoch Chandra observations
  69. GRB020604, optical observations
  70. GRB020604, BVRcIc field photometry
  71. GRB020603, BVRcIc field observations
  72. GRB020531, BVRcIc field photometry
  73. GRB020531 Optical observations with TAROT
  74. GRB020531 Optical observations with TAROT
  75. GRB 020418, optical/near-IR observations
  76. GRB 020531, Radio Observations
  77. GRB020531 Optical Observations
  78. GRB020531: Observations with the Chandra X-ray Observatory
  79. GRB 020603: Optical Observations
  80. GRB 020603, R-band observation
  81. GRB020531: Upper Limit for Detection of Two TAROT Sources
  82. GRB 020603: Optical observations
  83. GRB 020531 optical observations with TAROT
  84. Refined IPN error box for GRB020531
  85. GRB020531, optical observations
  86. GRB020531: optical observations
  87. GRB020531, optical observation
  88. GRB020531(=H2042): Optical Observations
  89. IPN triangulation of the short, hard GRB020531 (=H2042)
  90. GRB020531(=H2042): Optical Observations
  91. GRB020531: Optical observations
  92. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  93. GRB 020525: Optical Observations
  94. GRB020525, optical observations
  95. IPN detection of possible bursts from SGR1806-20
  96. HETE Observations of GX354-0 (= MXB1728-34, so-called "Slow
  97. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  98. IPN triangulation of a burst from SGR1806-20
  99. GRB/XRF 020427, Radio Observations
  100. HST detection of the likely host galaxy of GRB 020124

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